diff --git a/tests/test-cat b/tests/test-cat
--- a/tests/test-cat
+++ b/tests/test-cat
@@ -5,12 +5,12 @@ cd t
 hg init
 echo 0 > a
 echo 0 > b
-hg ci -A -m m -d "0 0"
+hg ci -A -m m -d "1000000 0"
 hg rm a
 hg cat a
 sleep 1 # make sure mtime is changed
 echo 1 > b
-hg ci -m m -d "0 0"
+hg ci -m m -d "1000000 0"
 echo 2 > b
 hg cat -r 0 a
 hg cat -r 0 b